diff --git a/docs/customization.md b/docs/customization.md
index 515e3c7f2f5..edd840db7d5 100644
--- a/docs/customization.md
+++ b/docs/customization.md
@@ -510,6 +510,7 @@ OpenAPI Normalizer transforms the input OpenAPI doc/spec (which may not perfectl
 
 - SIMPLIFY_ONEOF_ANYOF 
 - SIMPLIFY_BOOLEAN_ENUM
+- REFACTOR_ALLOF_WITH_PROPERTIES_ONLY (default to true since v7.5.0)
 
 (One can use `DISABLE_ALL=true` to disable all the rules)
 
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java
index 83277ace932..d3b26362dd1 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java
@@ -147,6 +147,7 @@ public class OpenAPINormalizer {
         // rules that are default to true
         rules.put(SIMPLIFY_ONEOF_ANYOF, true);
         rules.put(SIMPLIFY_BOOLEAN_ENUM, true);
+        rules.put(REFACTOR_ALLOF_WITH_PROPERTIES_ONLY, true); // default to true since v7.5.0
 
         processRules(inputRules);
     }